NOAO >   Observing Info >   Approved Programs >   2019A-0378

Small NOAO Logo

Program Information for 2019A-0378


PI: Ben Rosenwasser, U. of Wisconsin, Madison, rosenwas@astro.wisc.edu
Address: Astronomy Department, 475 N Charter St., Madison, WI 53703 United States

CoI: Bart Wakker, U. of Wisconsin, Madison
CoI: Tae Sun Kim, U. of Wisconsin, Madison

Title: Deep imaging and spectroscopy of [OIII] absorber fields

Abstract: We propose to complete the deep imaging of the fields of 19 quasars that contain intervening [OIII] systems in their spectra. We also propose for 2 nights with HYDRA to begin the spectroscopic followup of candidate galaxies that are associated with each absorption system. This is a two stage observation campaign with WIYN to study galactic outflows using emission and absorption abundance measures. The absorption systems contain unsaturated far UV lines for at least two oxygen ions (OII,OIII,OIV,OV,OVI) and the Lyman series that allow for a measurement of the oxygen gas phase abundance, [O/H], in the circumgalactic medium (CGM) of low redshift galaxies. The absorbers are likely associated with emission line galaxies with L/L$^*$ $>$ 0.1 within several arc minutes of the sightline ($< Mpc proper), whose properties allow for a measure of [O/H] within their star forming regions. We will uncover whether there is a difference between [O/H] in emission and absorption, which sheds light on the propagation speed and evolution of galactic outflows thought to be in part powered by star formation. Of our 27 total sightlines, 4 have previously been studied to our proposed limiting magnitude (0.1 L$^*$), while 4 others lie in the southern hemisphere, leading to a total of 19 sightlines. 0.1 L$^*$ corresponds to 23 $<$ $r$ $<$ 24 for the redshift range of our sample, a depth which can be reached with 9x3 minute ODI exposures. Because we plan to eventually observe all targets in in the field with Hydra, we require imaging in only one broadband. We ask for 3 gray nights in April to finish the imaging for all of our fields. The degree of completion depends on our preliminary ODI run in 2018B. With good weather and an average of 1 hour per field, 2 nights is the minimum to complete the program, assuming we can observe roughly 10/19 fields in 2018B. We ask for 2 dark nights in February/March to perform a pilot Hydra followup on the fields observed in 2018B.

Program Type: WTAC

Scheduled Nights:
Run 1 (2019A):  WIYN/ODI -- 4n on Apr 13 - Apr 14 2019, Apr 26 - Apr 27 2019
Run 2 (2019A):  WIYN/HYDR -- 2n on Mar 29 - Mar 30 2019


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2019A-0378

noaoprop-help@noao.edu

Small NOAO Logo